JAMMING by Rimantas Pleikys

p. 130

WHAT ABOUT HF FEEDER JAMMING?

For forty years after World War II, until the arrival of sophisticated communications satellites, the distribution of radio programs to overseas relay stations was done using High Frequency feeder transmissions. It is possible that during that time the Soviet Union may have tried to jam those channels too, but there is no information available to confirm this. Jamming of HF feeders would have been a technically complex endeavour because the receiving stations used highly directional antennas. The Soviets could have effectively blocked American feeders from Havana, Cuba. One wonders whether the Soviet engineers were really capable of thinking up such a dirty trick? Below is depicted a HF feeder transmitter, 50 kW, at the Greenville (North Carolina) transmitting facility, used by the "Voice of America". At this site VOA had 6 of these transmitters. They were kept as a reserve (together with telephone lines) to relay programs to the overseas stations. The transmitter depicted here operated at 18275 kHz frequency in ISB mode (picture taken in 1994).

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